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I keep buying new expansion caps and my coolant seems to stay full for about 4-5 days then starts dropping again, always going down to about "2 -3 fingers" from the bottom.

Can something be damaging the expansion caps, or maybe a bad batch from the same dealer.

I also read about water pump maybe being the cause as I have had the car checked for HGF and pressure tested recently and everything was fine. How would I be able to tell if the water pump is faulty??
 

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Ian,

Make sure the top of the expansion bottle isn't damaged. If it is then the cap won't make a good seal. The other thing to do is wrap some kitchen towel round the neck of the bottle then if it's leaking there you will see the telltake signs on the paper. Also, have a look at the top rubber hose going into the bottle - it's not unknown for it to need a new clip.
 
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